Subtract 3/10 from 20/70
20/70 - 3/10 is -1/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 10 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 70 × 1 = 70,
20/70 = 20 × 1/70 × 1 = 20/70 - Likewise, for the 2nd fraction, since 10 × 7 = 70,
3/10 = 3 × 7/10 × 7 = 21/70 - Subtract the two like fractions:
20/70 - 21/70 = 20 - 21/70 = -1/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/70-3/10 20/70-6/10 20/70-3/20 60/70-3/10 20/70-9/10 20/70-3/30 20/70-15/10 20/70-3/50 20/70-21/10 20/70-3/70